Grinding machine



July 31, 1923.

,. O. F. PRESBREY GRINDING MACHINE '6 Sheets-Sheet l Filed Oct; 2'7.' 1921 INVENTOR ATTORNEY.

July 1', 1923. 1,463,335

O. F. PRESBREY I GRINDING MACHINE Filed Oct. 27. 1921 3 Sheets-Sheet 2 INVENTOR;

- him/x6 w ATTdRNEY.

July 3 1, 1923.

- 3,463,335 0. F. PRESBREY I GRINDING momma Filed Oct. 27, 1921 s Sheets-Sheet 5 INVENTOR ATTORNEY Patented July 31, 1923.

n err err ea-i OTIS F. PRESBREY, OF BROOKLYN, NEW YORK.

' GRINDING MACHINE.

Application filed October 27, 1921. Serial No. 510,792.

T all whom it may cmwem:

Be it known that I, OTIS F. Pnnsnnnx, a

citizen of the United States, and a resident internal combustion engines, although it is to be understood that the machine of my invention is not limited in every instance to specific use for grinding the valves of internal combustion engines. The face of a poppet-valve lies at a forty-five degree angle to the axial center line of the valve and it is necessary in the grindingof the valve to maintain the face at this angle. present invention has been designed to assure the correct grinding of the face of poppet valves and to do this work in an expeditious manner.

The object of my invention'is to provide a comparatively inexpensive, simple and durable grinding machine having the ad justments hereinafter mentioned: and ca- 30. pable of efficient use.

The invention will be fully understood from the detailed description hereinafter presented, reference being had to the accompanying drawings, in which: v

Fig. 1 is a plan view, partly broken away, of a grinding machine constructed inaccordance with and embodying the invention;

Fig. 2 is a of the same; 7

Fig. 3 is a vertical section through a portion of the same, taken on the dotted line 8-3 of Fig. 1, and

Fig. 4 is a vertical section through a portion of the same, taken on the dotted line 41- 1 of Fig. 1.

In the drawings, 10 designates the supporting bed for the operative featuresof the machine, this bed preferably beingin one integral casting with leg members 11 and of any convenient or suitable. outline and proportions.

I Upon the bed 10 and preferably integral "therewith is a standard 12, in the upper end end of said shaft 15 is fixed to the shaft front view, partly broken away,

of which is secured, by meansv of a screw 13, a stationary axle or cylindricalrod-M;

which projects toward'the front of the ma-.

chine andhas mounted thereon a'rotary tubular shaft 15. Upon the shaft 15 is y 60 wheel 17, clamping. disks 18engaging oppo- I mounted the grinding wheel 16, a pulley site faces of said grinding wheel and a shipper hub or disk19, said disk 19 jbeinga clamping-nut screwed upon the threaded forward portion of the shaft '15 andservmg, as one purpose, .as a nut for binding.

the disks l8. grinding wheel 16 and pulley v wheel 17 together upon the inner nonthreaded portion of said shaft '15. shaft 15 is slidable upon the axle 14 so as to permit the grinding wheel 16 to'be ad The justed toward'and from 'or'along the work,

and as means for adiustingthe shaft'15 and grinding wheel 16 along the axle ii. I

provide a shipper-frame 20 having upper I and lower arms 21 carrying pins 22 within I an annular groove 23' formed in the'hub or 'disk 19 and which 'frame20fis' pivotally' mounted by-Ineans of a screw 24 on the up- .per en'd of a standard 25 projecting upwardly from the bedplate 10. The frame 20 is. formed integrally with a handle "or of the standard 2 5 and operate through the pins 22 and disk 19 to shift or adjust'the :lever 26 by means of which said frame may be given a pivotal action on the up'perend tubular shaft 15 forwardly or rearwardly, I

with the parts carried thereby; on the axle 14. I preferably close the outerv end ofthei 4 tubular shaft 15 by means of a threaded cap 27; the pulley wheel 17 on the inner imparts rotary motion th reto standards 28, 29 connected together at their and is hollow and provides bearin s 31' for a tubular shaft 32 carrying a pulley-wheel 33 and chuck 34 for the stem ofthe valve 45 grinding wheel 16.

ion

and chuck 34- are arranged at an angle of I forty-five degrees to the grindingwheellti,

and this is for the purpose of so holdingthe valve that its face may be grou'ndat'anqan' gle of forty-five degrees-wi h the use of the wheel 16. The chuck 34 is not shown i'nde- I tail, since it is a well known form of spring self-closing chuck of the type shown in Letters Patent of the United States No. 1,104,255, dated July 21, 1914, to George W. Emrick, or No. 1,030,988, granted July 2, 1912, to George W. Emrick. The chuck 34 and tubular shaft 32 receive the stem of the valve 35 and said chuck tightly grips said stem, leaving the valve proper exposed for subjection to the action of the grinding wheel 16. In my construction I provide for the adjustment or movement of the chuck 34, wheel 33 and tubular shaft 32 longitudinally within the bearings 31, said parts beingconnected together by the fact that the chuck and wheel are screw threaded upon the projecting end of said shaft 32, and as means for adjustin the shaft 32 and parts carried thereby on the longitudinal line of said shaft and along the line of a forty-five degree angle to the grinding wheel 16, I provide the wheel 33 with a grooved hub 35 and engage the same with a pivoted shipper lever 36 operable by means of handle rod 37 On the movement of the lever 36 from the rodv 37, the pulleywheel 33 and parts connected therewith may be slid in a direction from or toward the standard 29, the wheel 33 being shown in F 4 in its extreme outer adjustment in a direction from the standard 29.

The means for driving the grinding wheel 16 and pulley-wheel 33 and through said pulley-wheel the chuck 34, shaft 32 and the work carried by said chuck, comprises an electric motor 38 mounted below the bed 10 and provided with a drum 39 and a pulleywheel '40. Upon the drum 39 is a cord or belt engaging the pulley-wheel 17 and said drum and belt impart rotary motion to said pulley-wheel 17 and to the grinding wheel 16. A cord or belt extending from the pul leywheel 40 to the pulley-wheel 33 serves as means for driving said wheel 33 and the parts connected therewith, and said belt will be twisted around an. idler 41 so as to impart movement in the correct direction to said wheel 33.

When the valve 45 is held by the chuck 34, the face of the valve to be ground is exposed and held parallel with the peripheral face of the grinding wheel 16. The grinding wheel 16 may, by means of the lever 26 and its connections, be, while in retation, slid or adjusted along the face of the valve 45 and be relied upon to truly grind said face even after the peripheral face of the grinding wheel may have become worn, since the grinding wheel may be made to travel toward and from the chuck 34and always evenly grind the face of the valve presented to it. When the valve is first introduced to the chuck 34, said chuck may be in the position in which it is shown in. F s. 1 and 4, and thereupon the chuck maybe moved rsarwardly by means or? the along the face of the valve so as to eiiiciently and accurately g ind the same. The machine of my invention provides two important adjustments, one being the adjustment of the grinding wheel and the other the adjustment of the chuck holding the valve or work, these two adjustments being of importance in securing rapid and eflicient duty. The two adjustments referred to may be made, either or both of them, while the machine is in operation, the rotation of the wheel and the rotation of the chuck not in any manner interfering with the adjustment of said parts. T he movement of the chuck 34 serves to correctly present the face of the valve to the grinding wheel and the adjustment of the grinding wheel cooperates with that of the chuck in bringing the working face of the grinding wheel against the face of the valve to be ground. The movement of the grinding wheel along the face of the valve is important in not only assuring the correct grinding of the valve, but in adapting the machine for valves varying in dimensions, in which respect, also, the adjustment of the chuck 34 is important.

The machine as a whole has been designed with the view of producing a machine of comparatively inexpensive construction and one in which the operative parts are exposed for observation and any necessary repair. The grinding of the valves is subject to the hand manipulation of the levers 26, 37, and hence the operator may at all times control the action of the machine with respect to the face of the valve.

What I claim as my invention and desire to secure by Letters-Patent, is:

The grinding machine hereinbefore described comprising a supporting bed plate, a rotary grinding wheel mounted thereon, means for manually moving said wheel during the rotation thereof along the line of its axis, a rotary self-closing chuck mounted on a tubular shaft at an angle to the peripheral face of said wheel and adapted to hold the work for presentation to said face, means for manually moving said chuck and its shaft along the line of the longitudinal axis thereof, and means for rotating said grind ing wheel and chuck, the means for mounting said grinding wheel being a stationary axle held in a standard extending upwardly from said bed-plate and a tubular shaft mounted on said axle and upon which said grinding. wheel, a pulley wheel and a threadshipper frame pivotally mounted n a stand ard extending upwardly from said bed-plate and having arms engaging said hub and a said 'pulley Wheel and a belt connection With a pulley Wheel on the tubular shaft of said chuck.

New York and State OfNGW York; this 21st day of October, A. D. 1921. OTIS F. PRESBREY.

. I 10 Signed at New York city, in the county of .7 

